Learn how to create a 10-volume surface using a second surface. The process will include drawing rectangles, offsetting lines, setting elevations, and creating a new surface in Civil 3D.
Key Insights
- The article delves into the procedure of creating a new 10-volume surface. This process involves drawing a rectangle, setting specific elevations, and offsetting lines internally by four and five feet.
- The author uses Civil 3D to create a new surface, which is named 'prop 13', in an existing surface. This newly created surface rises by two feet on the interior of the parcel.
- The process also involves creating a tin volume surface by comparing 'prop 13' to the base surface 'full development'. The article emphasizes not applying cut and fill factors to get an even comparison between the surfaces.
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In this video, we're going to go ahead and create a 10 volume surface. But to do that, we actually have to have a second surface to work with.
So I'm going to go ahead and create a surface just like we did in the previous videos when we worked on those surfaces that we drew off to the right hand side. I'm going to be creating a new surface inside of our current surface. So I'm going to go into my property 13 right here, which is not the farthest left, but the second one in.
I'm going to be drawing a rectangle where I'm going to snap to the endpoint of this segment here, and I'm going to snap to the endpoint of this segment here. I'm now going to offset this inward by five feet. I'm going to erase that outer line.
I'm going to offset this inward by four feet. So what I'm going to end up doing is I'm going to create a surface that rises up by two feet on the interior of this parcel. So this parcel, if I hover over the surface, what Civil 3D will do is it will return an elevation for my surface at the point that I'm hovering over.
So my full development surface has an elevation of 252.6 at this location. It has a elevation of 253.5 here. I have 252.987, and I have 253.538. So my lowest elevation is in this corner right here at 252.61. So what I'm going to go ahead and do is I'm going to choose this ring or this rectangle right here.
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I'm going to right click, choose properties. I'm going to go ahead and set this elevation as 252.5 so that I have a boundary of this surface that I'm going to create at a single elevation of 252.5. I'm going to go ahead and hit, click on global width, and then I'm going to hit escape so that I can have selected my 252.5 for this. And then I'm going to select my interior rectangle.
I'm going to add two feet to that. So I'm going to be 254.5 into my elevation box, and I'm going to hit ENTER, and then I'm going to close my properties window, and I'm going to escape. I'm now going to minimize my full development.
I'm going to click on surfaces, right click, and click create surface. I'm going to go ahead and type in a name for my surface of property 13 or prop 13. I'm going to go ahead and choose the style as 2 in 10 background and click okay.
And then I'm going to go ahead and click okay. Civil 3D is going to tell me that I can't have these characters, colon, and the carets, and the brackets. So I'm going to go ahead and go up and actually erase out the colon and hit a space.
So I'm going to go ahead and click okay. I'm going to drop down prop 13. I'm going to drop down definition.
I'm going to select contours, right click, select add, and then I'm going to go to my description and type contours prop 13. And then I'm going to go ahead and click okay. I'm going to select these two rectangles here and hit ENTER.
So what Civil 3D now has done is it's created a new surface, and if I go to object viewer, I can see it right here. It looks like this. Now, if I view it in conjunction with my major surface, and I select object viewer, and I go here, I can see it's right here where this gray rectangle is.
And if I zoom in and I rotate out, you'll be able to see it sitting here on this surface. Now, it intersects down below here and that's okay. We're going to go ahead and do a volume surface with both of these, and we'll see what happens there.
So I'm going to go ahead and close this out, and I'm going to go ahead and minimize this, minimize this, and I'm going to go ahead and go to surfaces, right click, create surface. Now, I'm going to drop down my type, and I'm going to go to tin volume surface. We now get this extra piece of information for volume surfaces right here, where we have a base surface choice, a comparison surface choice, cut factor, and fill factor.
So first, what I'm going to go ahead and do is I'm going to type in my name as volume prop 13. And I'm going to go ahead and go down to my style, which I'm going to leave as 2 in 10 background. I'm going to go to my base surface.
My base surface is my main surface. So I'm going to go ahead and choose full development. And then my comparison surface is my prop 13.
So I'm comparing prop 13 to my base surface. So I'm going to go ahead and click okay. And then I am not going to apply cut and fill factor.
You can apply cut and fill factors, and it will adjust your cut and fill volumes based on certain factors. If you have an office where you use cut and fill factors, then you can go ahead and do that. I generally leave my cut and fill factors as one, so that I can get an even comparison between the surfaces, not the cut and fill factors.
So I'm going to go ahead and click okay. So what I've done now is I have created that volume surface. I'm going to go ahead and view what that volume surface looks like.
But first, I want to turn off prop 13 by right-clicking, selecting surface properties, going to the information tab, dropping down surface style, selecting no display, and clicking apply, and clicking okay. I'm also going to go to full development, right click, surface properties, surface style, drop down, no display, click apply, click okay. And so now I have this volume for prop 13.
I'm going to go ahead and click on it. I'm going to click object viewer. And so what we're going to see here when we go to the object viewer is that we are going to see the comparison between our prop 13 and our comparison surface.
So from here, I'm going to go ahead and save my drawing. And then I will meet you in the next video when we start looking at surface statistics.
